Pulse Control of Decoherence in a Qubit Coupled with a Quantum Environment | Zendy

Takahiro Murakami | Zendy; Yositake Takane | Zendy

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Pulse Control of Decoherence in a Qubit Coupled with a Quantum Environment

Author(s) -

Takahiro Murakami,

Yositake Takane

Publication year - 2005

Publication title -

journal of the physical society of japan

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.76

H-Index - 139

eISSN - 1347-4073

pISSN - 0031-9015

DOI - 10.1143/jpsjs.74s.265

Subject(s) - quantum decoherence , qubit , physics , phase qubit , density matrix , flux qubit , quantum mechanics , pulse (music) , charge qubit , quantum , voltage

We study the time evolution of a qubit linearly coupled with a quantumenvironment under a sequence of short pi pulses. Our attention is focused onthe case where qubit-environment interactions induce the decoherence withpopulation decay. We assume that the environment consists of a set of bosonicexcitations. The time evolution of the reduced density matrix for the qubit iscalculated in the presence of periodic short pi pulses. We confirm that thedecoherence is suppressed if the pulse interval is shorter than the correlationtime for qubit-environment interactions.Comment: 5 pages, 2figure

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